The Lord Jesus clearly taught that unless a person is born again they can't enter the Kingdom of God (John 3:3). Below are some scriptures that explain more about how to be born again.

As it is written, There is none righteous, no, not one: There is none that understandeth, there is none that seeketh after God. They are all gone out of the way, they are together become unprofitable; there is none that doeth good, no, not one. Romans 3:10-12

For all have sinned, and come short of the glory of God; Romans 3:23

For the wages of sin is death; but the gift of God is eternal life through Jesus Christ our Lord. Romans 6:23

For the wrath of God is revealed from heaven against all ungodliness and unrighteousness of men, who hold the truth in unrighteousness; Romans 1:18

Therefore by the deeds of the law there shall no flesh be justified in his sight: for by the law is the knowledge of sin. Romans 3:20

But God commendeth his love toward us, in that, while we were yet sinners, Christ died for us. Much more then, being now justified by his blood, we shall be saved from wrath through him. Romans 5:8,9

Even the righteousness of God which is by faith of Jesus Christ unto all and upon all them that believe: for there is no difference: Romans 3:22

That if thou shalt confess with thy mouth the Lord Jesus, and shalt believe in thine heart that God hath raised him from the dead, thou shalt be saved. For with the heart man believeth unto righteousness; and with the mouth confession is made unto salvation. Romans 10:9,10

For whosoever shall call upon the name of the Lord shall be saved. Romans 10:13